Do you have an e-diff if as you say rear diff clutch relayed codes? Have you ever changed the rear diff oil (its a "special" lr fluid).
Codes related to the transmission are typically related to individual clutch packs A, B, C
D etc. Recent trans fluid change? Low fluid levels means the tc can't lock and the clutch packs slip. Dirty fluid or worn valve body leads to bypass and valves not closing fully, again not enough fluid pressure to operate clutch packs correctly.
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